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<meta charset="utf-8" />
<title></title>
<style type="text/css">
  div.w2 { width: 2em }
  div.w3 { width: 3em }
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<div class="w2">月火水木金土</div>
<div class="w3">月火水木金土</div>
<hr>
<div class="w2">月火水木金土</div>
<div class="w3">月火水木金土</div>
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<div class="w2">月火水木金土</div>
<div class="w3">月火水木金土</div>
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